//语句是
var xxx = 5+6;
alert(xxx);
//语法树是
var stmts = [
	{
		type: "stmt-var",
		ctnt: {
			name: "xxx",
			val: {
				type: "expr-bin",
				ctnt: {
					left: {
						type: "expr-num",
						ctnt: "5"
					},
					op:{
						type: "op-bin",
						ctnt: "+"
					},
					right:{
						type: "expr-num",
						ctnt: "6"
					}
				}
			}
		}
	},
	{
		type: "stmt-call",
		ctnt: {
			root: {
				type: "expr-id",
				ctnt: "alert"
			},
			suffix: {
				args: [
					{
						type: "expr-id",
						ctnt: "xxx"
					}
				]
			}
		}
	}
];
